如何根据选定的值设置 WPF ComboBox 的 ToolTip？
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How to set the ToolTip of WPF ComboBox based on selected value?
提问by Relativity
I have a ComboBoxin my WPF application. Using below code I can set the ToolTipas selected value:
ComboBox我的 WPF 应用程序中有一个。使用下面的代码我可以设置ToolTip为选定的值：
ToolTip="{Binding Path=SelectedValue, RelativeSource={RelativeSource Self}}"
But if I need to set a separate value for ToolTipbased on ComboBoxselection, the following code is not working:
但是如果我需要ToolTip根据ComboBox选择设置一个单独的值，下面的代码不起作用：
<controls:ComboBoxEx.Style>
<Style TargetType="ComboBox" BasedOn="{StaticResource basicStyle}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=SelectedValue, RelativeSource={RelativeSource Self}}" Value="DAW">
<Setter Property="ToolTip" Value="abc"/>
</DataTrigger>
<DataTrigger Binding="{Binding Path=SelectedValue, RelativeSource={RelativeSource Self}}" Value="generic">
<Setter Property="ToolTip" Value="def"/>
</DataTrigger>
</Style.Triggers>
</Style>
</controls:ComboBoxEx.Style>
采纳答案by sa_ddam213
I'm not sure if I understand correctly, but if you are using a Styleyou should not have to use a DataTriggeror RelativeSource={RelativeSource Self}}"to access SelectedValue, you should be able to access via a Triggerusing the Property
我不确定我的理解是否正确，但是如果您使用的是 a Style，则不必使用 aDataTrigger或RelativeSource={RelativeSource Self}}"访问SelectedValue，您应该能够通过Trigger使用a进行访问Property
<Style TargetType="ComboBox">
<Style.Triggers>
<Trigger Property="SelectedValue" Value="DAW">
<Setter Property="ToolTip" Value="abc"/>
</Trigger>
<Trigger Property="SelectedValue" Value="generic">
<Setter Property="ToolTip" Value="def"/>
</Trigger>
</Style.Triggers>
</Style>
回答by Syed Waqas
Bind the tooltip to the display property of the selected item in this case i have property name display, if you have declarative ComboBox items then that would be
将工具提示绑定到所选项目的显示属性，在这种情况下，我有属性名称显示，如果您有声明性 ComboBox 项目，那将是
ToolTip="{Binding Path=SelectedItem.Content,ElementName=cmbbox_years}"
Else for custom object below code will work
否则对于下面的代码自定义对象将起作用
<ComboBox
Name="cmbbox_years"
DisplayMemberPath="display"
SelectedValuePath="value"
ItemsSource="{Binding Years}"
SelectedItem="{Binding YearSelectedItem}"
ToolTip="{Binding Path=SelectedItem.display,ElementName=cmbbox_years}"/>
